Think you need to strip to your lacy underthings to be a pin-up girl? Think again. At Carolina Herrera and Donna Karan, hair pins transformed basic hairstyles into something fresh and innovative. And best of all, trying this runway look doesn't cost much money — just a couple of bucks for hair pins, and you're good to go. Arrange them in angular groups as Orlando Pita did at Carolina Herrera, or space them out to create the illusion of movement as seen at Donna Karan. Finally, when it comes to "business in the front, party in the back," we no longer need to think of mullets.